ventilation and airtightness: european experiences …quality of ventilation systems in 1.287 new...
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Ventilation and airtightness: European experiences of on‐site performances and approaches for improvement
Peter Wouters
Manager INIVE EEIGInternational Network for Informationon Ventilation and Energy Performance
… and you expect a good quality
You expect a reliable label
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… and you expect a good quality
You expect a reliable label
… and you expect a good quality
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… and you expect good performances (air flow, acoustics, IAQ, energy, …)
You expect the presence of a ventilation system
Poor design and execution
• Energy performancescritical
• IAQ problematic
• acoustics
• Maintenance
• …
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EU QUALICHeCK project (2014‐2017)
QUALICHeCK project had 2 objectives…
• To set up a series of actions which should result in more attention and practical initiatives for actual compliance with the claimed energy performance for new and renovated buildingsi.e. ‘Boundary conditions which force people to do what they declare’;
• To set up a series of actions, which should result in more attention and practical initiatives for achieving a better quality of the works, i.e. ‘Boundary conditions which stimulate and allow the building sector to deliver good quality of the works’.
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About the status on the ground…
About interesting approaches…
About guidance for improvements
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QUALICHeCK products and outcomes
4 focus areas in QUALICHeCK
Transmission characteristics
Ventilation and airtightness
Sustainable summer comfort techniques
Renewables in multi‐energy systems
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Example from FRANCE:Quality of ventilation systems in 1.287 new dwellings
44 % of multi‐family dwellings don’t comply68% of single‐family dwellings don’t comply
Example from SWEDEN:Airtightness of air distribution systems
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QUALICHeCK products and outcomes • 2 booklets• 3 global reports• 2 source books• 9 country reports• 54 fact sheets• 6 newsletters• 16 webinars• 4 conferences• 4 focused technology workshops• 9 national roadshows• 3 special issues of REHVA Journal• …
www.qualicheck‐platform.eu
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Source book on quality of the works
Aim:To give guidance towards better frameworks for quality of the works
Factsheets
What is a factsheet?Short document on a specific topic
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OPTION 1: systematic test by certified testerOPTION 2: Quality management approach (see other factsheet)
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MULTI FAMILY DWELLINGS
SINGLE FAMILY DWELLINGS
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Quality frameworks in Flemish Region( Belgium)• Insulation of existing cavity walls
• Operational since July 2012
• About 90.000 buildings done since then
• Internal insulation of external walls• Only by “competent” contractors
• External insulation• In preparation
• Building airtightness• For new buildings since January 2015
• If not done in quality framework: use of default value
• Residential ventilation• For building permits after January 1 2016
• If not done in quality framework: air flow rate = 0 m³/h
DRIVER: SUBSIDIES
DRIVER: ENERGY LEGISLATION
Practical information on airtightness and ventilation quality frameworks
•Quality framework for building airtightness:• About 3 years of experience
•Quality framework for residential ventilation:• For new buildings with building permit after January 2016• In practice limited number of dossiers
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Quality framework for airtightness testing
Context:
•NOTmandatory
•BUT if done outside quality framework: use of default value• 12 m³/h.m² of building envelope
• In practice: will become standard practice with increasing requirements on energy efficiency See next slide
All buildings
% of new
build
ings tested
in quality fram
ework
Individual
Apartments
Year of building permit
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Who can do a test?
•No requirement of independence• Contractor can test his own building
•Proof of competence: • Theoretical exam• Practical exam
Control by third party organisation
•Desktop checks•10 % of submitted reports are checked
• In situ checks•10 % of tests are checked on‐site• Or during the test itself
• Appropriate equipment? Preparation of building? Testing and reporting
• Or after test (based on SMS message)• Is there a reliable reporting?
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SMS procedure
• SMS 1: If airtightness tester believes a test is possible:• SMS 1: dossier number + estimated time of finishing test
• SMS 2: If test is finalised:• SMS 2: measured result
• BCCA actions in case on‐site check are the requirements:• Within 5 minutes: an SMS indicating that an inspector will come on site
• Within 20 minutes: inspector must be on‐site
Desktop checks – BCCA statistics for 2017
•About 6.200 buildings tested•How many checks: 10,1% of reports (631 checks)
•At least one check for each testing company : 152 companies were checked (100%)
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In situ checks – BCCA statistics for 2017
• Checks: 10,2% of reports (634 inspections)• 66% after sending of SMS
• Also during weekend
• Duration of inspection?• Average duration of inspection: 21,5 minutes
• Average waiting time for inspection to arrive: 2,8 min
Since 10% of tests are checked: average time ‘loss’: about 2.5 minutes
In situ checks– statistics 2017 – 634 inspections
What did they declare in the SMS message?
Result during check
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In situ checks – statistics 2017
Distribution of results (m³/h.m² at 50 Pa)
0 1 2 3 4 5 6 7 8 9 10 11 12
In situ checks – statistics 2017
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In situ checks – statistics 2017
Location of airtightness testing
Location of in situ checks
In situ checks – statistics 2017
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Characteristics Flemish VENTILATION quality framework
• Mandatory scheme in context of requirements for new buildings
• Major elements:• “Competent” person(s)must execute a number of activities
• Ventilation pre‐design concept• Major objective: inform the building owner
• Ventilation performance report• Declaration of performances of ventilation system
• Desktop checks – 10%• In situ tests – 10%
Competence: Online exams# of persons
Coordinator 686
Designer 800
Rapporteur supply openings 737
Rapporteur transfer openings 999
Rapporteur exhaust openings 648
Rapporteur mechanical ventilation 784
Competence: Practical testsRapporteur mechanical ventilation: about 350 persons
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Conclusions• Is is not evident to assume that:• everybody is following the regulations• Everybody reports correctly
• There are various interesting approaches for achievingbetter compliance